字母导航跳转react核心代码

componentDidMount() {
	this.move();
}
skipToDep(e) {
    let dom = document.getElementById(e); // 获取要跳至的字母节点
    const scroller = this.props.scroller;
    if (e === '#') {
        scroller.scrollTo(0, 0);
    } else {
        if(-dom.offsetTop >= scroller.maxScrollY) {
            scroller.scrollTo(0, -dom.offsetTop);
        } else {
            scroller.scrollTo(0, scroller.maxScrollY);
        }
    }
}
move() {
	// 监听字母导航列表的touchmove事件
    this.navigation.addEventListener('touchmove', e => {
        const node = document.elementFromPoint(e.touches[0].clientX, e.touches[0].clientY); // 获取move时对应的节点
        const reg = /^(#|[A-Z])/;
        if(reg.test(node.innerText)) {
            this.skipToDep(node.innerText);
        }
    });
}